US5014071A - Ferrite rod antenna - Google Patents

Ferrite rod antenna Download PDF

Info

Publication number
US5014071A
US5014071A US07/374,012 US37401289A US5014071A US 5014071 A US5014071 A US 5014071A US 37401289 A US37401289 A US 37401289A US 5014071 A US5014071 A US 5014071A
Authority
US
United States
Prior art keywords
antenna
core
circuit board
printed circuit
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/374,012
Inventor
Jeffrey S. King
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Priority to US07/374,012 priority Critical patent/US5014071A/en
Assigned to MOTOROLA, INC. reassignment MOTOROLA, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KING, JEFFREY S.
Priority to PCT/US1990/002680 priority patent/WO1991000627A1/en
Application granted granted Critical
Publication of US5014071A publication Critical patent/US5014071A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components

Definitions

  • This invention relates generally to a ferrite rod antenna. More particularly, the present invention relates to a ferrite rod antenna wherein a single piece of wire forms both the antenna coil and a retention means for the antenna assembly.
  • Antenna elements have been down sized in order to meet the manufacturing and size constraints which accompany the trend towards smaller paging and radio receiver packages. Such antennas, however, must nevertheless provide a sufficiently high (Q) while simultaneously exhibiting sufficient radiated signal sensitivity.
  • U.S. Pat. No. 3,267,478, issued Aug. 16, 1966 describes an antenna which comprises a cylindrical core surrounded by a sleeve of electrically conductive material.
  • a gap runs the entire length of the sleeve and has a plurality of capacitors distributed throughout its length.
  • a coupling winding surrounds at least a portion of the core and includes a pair of wires for coupling the antenna assembly to the receiver.
  • the antenna provides no means for readily mounting the antenna assembly to a printed circuit board. Thus, this antenna system would not be suitable for use in conjunction with todays more complex mounting and circuit interconnection techniques.
  • U.S. Pat. No. 3,594,805 issued Jul. 20, 1971 describes an antenna in which the resonant frequency may be adjusted by varying the inductance of a first split sleeve.
  • the opposite edges of the longitudinal split are connected by a plurality of capacitors uniformly distributed over the length of the sleeve.
  • the first sleeve additionally includes a longitudinal slot approximately one third the length of the rod.
  • a second split sleeve is positioned over the first sleeve to adjust the inductance of the assembly by masking poritons of the longitudinal slot.
  • U.S. Pat. No. 3,946,397 discloses an antenna arrangement which includes a spiral inductor or coil which is divided into a number of segments interconnected by individual capacitor elements to form a number of series resonant circuits. While an effective antenna technique, this arrangement still does not describe a simple mechanism for implementation and connection to a printed circuit board.
  • U.S. Pat. No. 4,814,782 issued Mar. 21, 1989 discloses an antenna which includes a generally elongate, magnetically permeable core having a major axis and an insulating substrate affixed along an axis parallel to the major axis.
  • the insulating substrate has a plurality of opposed pairs of conductive runners positioned at generally regular intervals along the substrate normal to the major axis.
  • a plurality of discrete capacitors are secured between opposite pairs of conductive runners.
  • An electrically conductive split sleeve substantially surrounds the core and has pairs of opposed tabs on the edge portions in electrical connection with the opposed pairs of conductive runners.
  • the sleeve further includes integral mounting tabs for securing the antenna assembly to the printed circuit board to establish electrical connection to the antenna without the use of wire leads.
  • the system described in this latter patent involves an assembly process which is both complex and costly.
  • the capacitors are attached to the printed circuit board by a reflow process, and the sleeve is hand soldered.
  • the ferrite core or rod must be aligned in the sleeve and then glued thereto.
  • the ferrite core is also glued to the printed circuit board.
  • a copper strip is wrapped around the ferrite core (i.e. 5 turns).
  • the strip is aligned, and the assembly is then subjected to a shrink wrap process.
  • the shrink wrap is then cut to expose the leads, the assembly is glued to the printed circuit board, and the leads are soldered.
  • an antenna for coupling to a printed circuit board comprising of a ferrite rod and an electrically conductive coil having at least one turn extending around the core.
  • the ends of the coil form the antennas leads and are bent to retain the core therebetween.
  • the coil is also bent to form one or more protrusions which extends away from the core.
  • the antenna's leads and the protrusions may be fixably coupled to a printed circuit board to secure the antenna.
  • FIG. 1 is an exploded view of a ferrite rod antenna in accordance with the present invention and illustrates how the antenna can be coupled to a printed circuit board;
  • FIG. 2 is an end view of the coil utilized in the antenna assembly shown in FIG. 1;
  • FIG. 3 is a side view of the coil utilized in the antenna assembly shown in FIG. 1.
  • the inventive antenna assembly comprises a core 10 of magnetically permeable material (a ferrite rod) which is positioned within the turns of an electrically conductive coil 12 (shown in more detail in FIGS. 2 and 3). Also shown in FIG. 1 is a printed circuit board 14 having a plurality of circular plated holes 16 and elongate plated holes 18 therethrough. These holes are produced in accordance with well known printed circuit board techniques.
  • coil 12 has first and second ends 20 and 22 which form the antenna's leads. These leads each have a portion 24 and 26 respectively which is bent upward so as to reside adjacent the ends of core 10. In this manner, core 10 is retained within coil 12 and between leads 20 and 22. Additionally, lower portions of coil 12 are bent to form protrusions 28 which extend away from core 10. These protrusions 28 may be inserted into apertures 18 and the ends of leads 20 and 22 may be inserted into apertures 16 in the printed circuit board. Next, using any one of a number of known techniques (e.g. soldering, reflow, etc.) leads 20 and 22 and protrusions 28 can be fixedly coupled to the printed circuit board. As a result, bent portions 24 and 26 on the coil retain core 10 in position while the interaction of apertures 16 and 18 with leads 20 and 22 and protrusions 28 fixed the position of the coil on the printed circuit board.
  • soldering, reflow, etc. soldering, reflow, etc.
  • an antenna system for coupling to a printed circuit board which requires only two components, a ferrite core and a single piece of wire which may be pre-formed to a desired configuration.
  • the wire serves as a multi-functional piece part and replaces many of the previously needed components.
  • the coil completely retains the core in all directions thus substantially reducing the possibility of disassembly if the device is subjected to shock or vibration.
  • Coil 12 is positioned on the printed circuit board by apertures 16 and 18 which determine the exact spacing of the loops. After the antenna assembly has been positioned on the printed circuit board, no hand soldering is required. The part can be easily reflowed with core 10 in place.

Abstract

An antenna for coupling to a printed circuit board comprises a ferrite rod and an electrically conductive coil having at least one turn extending around the core. The ends of the coil form the antenna's leads and are bent to retain the core therebetween. The coil is also bent to form a protrusion which extends away from the core. The antenna's leads and the protrusion may then be coupled to a printed circuit board to secure the antenna.

Description

BACKGROUND OF THE INVENTION
This invention relates generally to a ferrite rod antenna. More particularly, the present invention relates to a ferrite rod antenna wherein a single piece of wire forms both the antenna coil and a retention means for the antenna assembly.
Antenna elements have been down sized in order to meet the manufacturing and size constraints which accompany the trend towards smaller paging and radio receiver packages. Such antennas, however, must nevertheless provide a sufficiently high (Q) while simultaneously exhibiting sufficient radiated signal sensitivity.
U.S. Pat. No. 3,267,478, issued Aug. 16, 1966 describes an antenna which comprises a cylindrical core surrounded by a sleeve of electrically conductive material. A gap runs the entire length of the sleeve and has a plurality of capacitors distributed throughout its length. A coupling winding surrounds at least a portion of the core and includes a pair of wires for coupling the antenna assembly to the receiver. Unfortunately, the antenna provides no means for readily mounting the antenna assembly to a printed circuit board. Thus, this antenna system would not be suitable for use in conjunction with todays more complex mounting and circuit interconnection techniques.
Similarly, U.S. Pat. No. 3,594,805, issued Jul. 20, 1971 describes an antenna in which the resonant frequency may be adjusted by varying the inductance of a first split sleeve. The opposite edges of the longitudinal split are connected by a plurality of capacitors uniformly distributed over the length of the sleeve. The first sleeve additionally includes a longitudinal slot approximately one third the length of the rod. A second split sleeve is positioned over the first sleeve to adjust the inductance of the assembly by masking poritons of the longitudinal slot. As was the case before, no adequate means are disclosed for mounting the antenna assembly to a printed circuit board. Furthermore, wire leads are necessary for forming the electrical connections between the circuit and the antenna.
U.S. Pat. No. 3,946,397, issued Mar. 23, 1976 discloses an antenna arrangement which includes a spiral inductor or coil which is divided into a number of segments interconnected by individual capacitor elements to form a number of series resonant circuits. While an effective antenna technique, this arrangement still does not describe a simple mechanism for implementation and connection to a printed circuit board.
In an effort to overcome the above described disadvantages, U.S. Pat. No. 4,814,782, issued Mar. 21, 1989 discloses an antenna which includes a generally elongate, magnetically permeable core having a major axis and an insulating substrate affixed along an axis parallel to the major axis. The insulating substrate has a plurality of opposed pairs of conductive runners positioned at generally regular intervals along the substrate normal to the major axis. A plurality of discrete capacitors are secured between opposite pairs of conductive runners. An electrically conductive split sleeve substantially surrounds the core and has pairs of opposed tabs on the edge portions in electrical connection with the opposed pairs of conductive runners. The sleeve further includes integral mounting tabs for securing the antenna assembly to the printed circuit board to establish electrical connection to the antenna without the use of wire leads.
Unfortunately, the system described in this latter patent involves an assembly process which is both complex and costly. For example, the capacitors are attached to the printed circuit board by a reflow process, and the sleeve is hand soldered. The ferrite core or rod must be aligned in the sleeve and then glued thereto. The ferrite core is also glued to the printed circuit board.
In a low band version of this antenna assembly, a copper strip is wrapped around the ferrite core (i.e. 5 turns). The strip is aligned, and the assembly is then subjected to a shrink wrap process. The shrink wrap is then cut to expose the leads, the assembly is glued to the printed circuit board, and the leads are soldered.
These processes are complex, time consuming, and result in an arrangement which is easily damaged during normal use. It would therefore be highly desirable to provide a ferrite rod antenna assembly which can be easily mounted and electrically connected to a printed circuit board.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an approved ferrite rod antenna structure.
It is a further object to the present invention to provide a ferrite rod antenna assembly which may be easily mounted on a printed circuit board.
It is still a further object to the present invention to provide a ferrite rod antenna assembly which is simple and self fixturing.
According to a broad aspect of the invention there is provided an antenna for coupling to a printed circuit board, the antenna comprising of a ferrite rod and an electrically conductive coil having at least one turn extending around the core. The ends of the coil form the antennas leads and are bent to retain the core therebetween. The coil is also bent to form one or more protrusions which extends away from the core. The antenna's leads and the protrusions may be fixably coupled to a printed circuit board to secure the antenna.
The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view of a ferrite rod antenna in accordance with the present invention and illustrates how the antenna can be coupled to a printed circuit board;
FIG. 2 is an end view of the coil utilized in the antenna assembly shown in FIG. 1; and
FIG. 3 is a side view of the coil utilized in the antenna assembly shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, the inventive antenna assembly comprises a core 10 of magnetically permeable material (a ferrite rod) which is positioned within the turns of an electrically conductive coil 12 (shown in more detail in FIGS. 2 and 3). Also shown in FIG. 1 is a printed circuit board 14 having a plurality of circular plated holes 16 and elongate plated holes 18 therethrough. These holes are produced in accordance with well known printed circuit board techniques.
Referring again to FIGS. 1, 2, and 3, coil 12 has first and second ends 20 and 22 which form the antenna's leads. These leads each have a portion 24 and 26 respectively which is bent upward so as to reside adjacent the ends of core 10. In this manner, core 10 is retained within coil 12 and between leads 20 and 22. Additionally, lower portions of coil 12 are bent to form protrusions 28 which extend away from core 10. These protrusions 28 may be inserted into apertures 18 and the ends of leads 20 and 22 may be inserted into apertures 16 in the printed circuit board. Next, using any one of a number of known techniques (e.g. soldering, reflow, etc.) leads 20 and 22 and protrusions 28 can be fixedly coupled to the printed circuit board. As a result, bent portions 24 and 26 on the coil retain core 10 in position while the interaction of apertures 16 and 18 with leads 20 and 22 and protrusions 28 fixed the position of the coil on the printed circuit board.
Thus, there has been described an antenna system for coupling to a printed circuit board which requires only two components, a ferrite core and a single piece of wire which may be pre-formed to a desired configuration. The wire serves as a multi-functional piece part and replaces many of the previously needed components. The coil completely retains the core in all directions thus substantially reducing the possibility of disassembly if the device is subjected to shock or vibration.
Coil 12 is positioned on the printed circuit board by apertures 16 and 18 which determine the exact spacing of the loops. After the antenna assembly has been positioned on the printed circuit board, no hand soldering is required. The part can be easily reflowed with core 10 in place.
To summarize, many piece parts previously required by prior art devices have been eliminated. Likewise, steps such as gluing, heating to shrink tubing, hand soldering, have likewise been eliminated. Coil to coil registration is more accurately maintained by the slots 18 in the printed circuit board. The inventive antenna assembly is sturdier, represents a significant cost reduction, and results in a significant cycle time reduction.
The above description is given by way of example only. Changes in form and details may be made by one skilled in the art without departing from the scope of the invention as define by the appended claims.

Claims (2)

What I claim is:
1. An antenna having provision for mounting to a printed circuit board having receiving apertures therein, said antenna comprising:
a core;
an electrically conductive coil having at least one turn extending around said core and having first and second end portions for retaining said core between said first and second end portions, said first and second end portions forming leads for insertion into first and second ones of said receiving apertures, said at least one turn having a portion which is bent to form a protrusion away from said core for insertion into a third one of said receiving apertures.
2. An antenna according to claim 1 wherein said core has a longitudinal axis and first and second end surfaces and wherein said first and second end portions of said coil reside adjacent said first and second end surfaces respectively.
US07/374,012 1989-06-30 1989-06-30 Ferrite rod antenna Expired - Fee Related US5014071A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/374,012 US5014071A (en) 1989-06-30 1989-06-30 Ferrite rod antenna
PCT/US1990/002680 WO1991000627A1 (en) 1989-06-30 1990-05-17 Ferrite rod antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/374,012 US5014071A (en) 1989-06-30 1989-06-30 Ferrite rod antenna

Publications (1)

Publication Number Publication Date
US5014071A true US5014071A (en) 1991-05-07

Family

ID=23474865

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/374,012 Expired - Fee Related US5014071A (en) 1989-06-30 1989-06-30 Ferrite rod antenna

Country Status (2)

Country Link
US (1) US5014071A (en)
WO (1) WO1991000627A1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5530358A (en) * 1994-01-25 1996-06-25 Baker Hughes, Incorporated Method and apparatus for measurement-while-drilling utilizing improved antennas
EP0762537A2 (en) * 1995-09-05 1997-03-12 Murata Manufacturing Co., Ltd. Chip antenna
EP0762536A2 (en) * 1995-09-05 1997-03-12 Murata Manufacturing Co., Ltd. Chip antenna
EP0802577A1 (en) * 1996-04-16 1997-10-22 Murata Manufacturing Co., Ltd. Chip antenna
EP0831546A2 (en) * 1996-09-20 1998-03-25 Murata Manufacturing Co., Ltd. Chip antenna and antenna device
EP1160918A2 (en) * 1998-08-12 2001-12-05 Sony Corporation Helical antenna and portable transceiver
US6329961B1 (en) 1996-08-22 2001-12-11 Murata Manufacturing Co., Ltd. Antenna and resonant-frequency-adjustment method therefor
WO2002027859A1 (en) * 2000-09-26 2002-04-04 Allgon Mobile Communications, Ab Rf connector
US6466174B2 (en) * 2001-02-08 2002-10-15 Centurion Wireless Technologies, Inc. Surface mount CHIP antenna
US20030114118A1 (en) * 2000-12-28 2003-06-19 Susumu Fukushima Antenna, and communication device using the same
US20030224817A1 (en) * 2002-03-28 2003-12-04 Stewart William J. Mobile communication apparatus
US20040233789A1 (en) * 2003-03-04 2004-11-25 Isao Oguchi Electronic timepiece with wireless information function
US20040264302A1 (en) * 2003-06-24 2004-12-30 Seth Ward System and method for synchronizing a parking meter clock
US20060027991A1 (en) * 2000-05-25 2006-02-09 Randy Schutt Height control system and sensor therefor
US7098858B2 (en) 2002-09-25 2006-08-29 Halliburton Energy Services, Inc. Ruggedized multi-layer printed circuit board based downhole antenna
US20060273873A1 (en) * 2005-06-06 2006-12-07 Hsin-Chen Chen Wire wound choke coil
US20090085807A1 (en) * 2007-10-02 2009-04-02 General Electric Company Coil array for an electromagnetic tracking system
US20090096693A1 (en) * 2007-10-10 2009-04-16 Rowland Jones Low frequency antenna
US7832952B2 (en) 2007-03-21 2010-11-16 Avery Dennison Corporation High-frequency RFID printer
US9979085B2 (en) 2015-05-07 2018-05-22 King Fahd University Of Petroleum And Minerals Ferrite-loaded circular waveguide antenna for 3D scanning

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653992A (en) * 1950-10-19 1953-09-29 Grayhill Terminal construction for electric coil forms
US3267478A (en) * 1962-01-19 1966-08-16 Philips Corp Tunable ferromagnetic rod loop antenna
US3403298A (en) * 1965-11-09 1968-09-24 Plessey Co Ltd Wire wound inductors/component substrate assemblies
US3594805A (en) * 1968-03-25 1971-07-20 Pye Ltd Ferrite rod antenna with longitudinally split sleeve
US3649939A (en) * 1970-01-13 1972-03-14 Standard Int Corp Electrical component
US3823403A (en) * 1971-06-09 1974-07-09 Univ Ohio State Res Found Multiturn loop antenna
US3946397A (en) * 1974-12-16 1976-03-23 Motorola, Inc. Inductor or antenna arrangement with integral series resonating capacitors
JPS54154245A (en) * 1978-05-26 1979-12-05 Matsushita Electric Ind Co Ltd Ferrite antenna
US4270128A (en) * 1976-06-21 1981-05-26 National Research Development Corporation Radio antennae
US4334228A (en) * 1980-07-17 1982-06-08 Johns Robert H Bifilar antenna trap
US4795991A (en) * 1986-01-13 1989-01-03 Murata Manufacturing Co., Ltd. Inlet type noise filter directly mounted to a PC board
US4814782A (en) * 1986-12-11 1989-03-21 Motorola, Inc. Single turn ferrite rod antenna and method
US4866573A (en) * 1986-05-30 1989-09-12 Bel Fuse, Inc. Surface mounted coil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629761A (en) * 1970-05-01 1971-12-21 Motorola Inc Broadband high-frequency transformer
US4335386A (en) * 1980-07-17 1982-06-15 Johns Robert H Bifilar antenna trap

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653992A (en) * 1950-10-19 1953-09-29 Grayhill Terminal construction for electric coil forms
US3267478A (en) * 1962-01-19 1966-08-16 Philips Corp Tunable ferromagnetic rod loop antenna
US3403298A (en) * 1965-11-09 1968-09-24 Plessey Co Ltd Wire wound inductors/component substrate assemblies
US3594805A (en) * 1968-03-25 1971-07-20 Pye Ltd Ferrite rod antenna with longitudinally split sleeve
US3649939A (en) * 1970-01-13 1972-03-14 Standard Int Corp Electrical component
US3823403A (en) * 1971-06-09 1974-07-09 Univ Ohio State Res Found Multiturn loop antenna
US3946397A (en) * 1974-12-16 1976-03-23 Motorola, Inc. Inductor or antenna arrangement with integral series resonating capacitors
US4270128A (en) * 1976-06-21 1981-05-26 National Research Development Corporation Radio antennae
JPS54154245A (en) * 1978-05-26 1979-12-05 Matsushita Electric Ind Co Ltd Ferrite antenna
US4334228A (en) * 1980-07-17 1982-06-08 Johns Robert H Bifilar antenna trap
US4795991A (en) * 1986-01-13 1989-01-03 Murata Manufacturing Co., Ltd. Inlet type noise filter directly mounted to a PC board
US4866573A (en) * 1986-05-30 1989-09-12 Bel Fuse, Inc. Surface mounted coil
US4814782A (en) * 1986-12-11 1989-03-21 Motorola, Inc. Single turn ferrite rod antenna and method

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5530358A (en) * 1994-01-25 1996-06-25 Baker Hughes, Incorporated Method and apparatus for measurement-while-drilling utilizing improved antennas
EP0762537A2 (en) * 1995-09-05 1997-03-12 Murata Manufacturing Co., Ltd. Chip antenna
EP0762536A2 (en) * 1995-09-05 1997-03-12 Murata Manufacturing Co., Ltd. Chip antenna
EP0762537A3 (en) * 1995-09-05 1997-04-09 Murata Manufacturing Co
EP0762536A3 (en) * 1995-09-05 1997-04-09 Murata Manufacturing Co
US5936593A (en) * 1995-09-05 1999-08-10 Murata Manufacturing Co., Ltd. Antenna apparatus having a spiral conductor and a coating layer
US5900845A (en) * 1995-09-05 1999-05-04 Murata Manufacturing Co., Ltd. Antenna device
US5861852A (en) * 1996-04-16 1999-01-19 Murata Mfg. Co. Ltd. Chip antenna
EP0802577A1 (en) * 1996-04-16 1997-10-22 Murata Manufacturing Co., Ltd. Chip antenna
US6329961B1 (en) 1996-08-22 2001-12-11 Murata Manufacturing Co., Ltd. Antenna and resonant-frequency-adjustment method therefor
EP0831546A3 (en) * 1996-09-20 1998-04-01 Murata Manufacturing Co., Ltd. Chip antenna and antenna device
EP0831546A2 (en) * 1996-09-20 1998-03-25 Murata Manufacturing Co., Ltd. Chip antenna and antenna device
EP1160918A2 (en) * 1998-08-12 2001-12-05 Sony Corporation Helical antenna and portable transceiver
EP1160918A3 (en) * 1998-08-12 2001-12-12 Sony Corporation Helical antenna and portable transceiver
US6434369B1 (en) 1998-08-12 2002-08-13 Sony Corporation Antenna device and portable transceiver
US20060027991A1 (en) * 2000-05-25 2006-02-09 Randy Schutt Height control system and sensor therefor
WO2002027859A1 (en) * 2000-09-26 2002-04-04 Allgon Mobile Communications, Ab Rf connector
EP1349233A1 (en) * 2000-12-28 2003-10-01 Matsushita Electric Industrial Co., Ltd. Antenna, and communication device using the same
US20030114118A1 (en) * 2000-12-28 2003-06-19 Susumu Fukushima Antenna, and communication device using the same
EP1349233A4 (en) * 2000-12-28 2005-01-19 Matsushita Electric Ind Co Ltd Antenna, and communication device using the same
US7038635B2 (en) 2000-12-28 2006-05-02 Matsushita Electric Industrial Co., Ltd. Antenna, and communication device using the same
US6466174B2 (en) * 2001-02-08 2002-10-15 Centurion Wireless Technologies, Inc. Surface mount CHIP antenna
US20030224817A1 (en) * 2002-03-28 2003-12-04 Stewart William J. Mobile communication apparatus
US7098858B2 (en) 2002-09-25 2006-08-29 Halliburton Energy Services, Inc. Ruggedized multi-layer printed circuit board based downhole antenna
US7839346B2 (en) 2002-09-25 2010-11-23 Halliburton Energy Services, Inc. Ruggedized multi-layer printed circuit board based downhole antenna
US20080094942A1 (en) * 2003-03-04 2008-04-24 Seiko Epson Corporation Electronic Timepiece with Wireless Information Function
US7433273B2 (en) * 2003-03-04 2008-10-07 Seiko Epson Corporation Electronic timepiece with wireless information function
US7701806B2 (en) 2003-03-04 2010-04-20 Seiko Epson Corporation Electronic timepiece with wireless information function
US20040233789A1 (en) * 2003-03-04 2004-11-25 Isao Oguchi Electronic timepiece with wireless information function
US20040264302A1 (en) * 2003-06-24 2004-12-30 Seth Ward System and method for synchronizing a parking meter clock
US20060273873A1 (en) * 2005-06-06 2006-12-07 Hsin-Chen Chen Wire wound choke coil
US7154367B1 (en) * 2005-06-06 2006-12-26 Hsin-Chen Chen Wire wound choke coil
US7832952B2 (en) 2007-03-21 2010-11-16 Avery Dennison Corporation High-frequency RFID printer
EP2357590A1 (en) 2007-03-21 2011-08-17 Avery Dennison Corporation High-frequency RFID printer
US20090085807A1 (en) * 2007-10-02 2009-04-02 General Electric Company Coil array for an electromagnetic tracking system
US20090096693A1 (en) * 2007-10-10 2009-04-16 Rowland Jones Low frequency antenna
US7671816B2 (en) * 2007-10-10 2010-03-02 Ethertronics, Inc. Low frequency antenna
US9979085B2 (en) 2015-05-07 2018-05-22 King Fahd University Of Petroleum And Minerals Ferrite-loaded circular waveguide antenna for 3D scanning

Also Published As

Publication number Publication date
WO1991000627A1 (en) 1991-01-10

Similar Documents

Publication Publication Date Title
US5014071A (en) Ferrite rod antenna
US5559676A (en) Self-contained drop-in component
US4661792A (en) Apparatus for mounting printed circuit boards
US4910482A (en) AC line filter
US4814782A (en) Single turn ferrite rod antenna and method
US3349405A (en) Antenna mounting article
US20060055408A1 (en) Balun arrangement and an installation method thereof for a magnetic resonance apparatus
US6064285A (en) Printed circuit board helical resonator and filter apparatus
JP2004140070A (en) High-frequency device
KR100279729B1 (en) Stacked Chip Inductors
EP0497556A1 (en) Print coil device for double tuning circuit
JPH06260341A (en) Surface-mounting mount for toroidal winding component
US4790030A (en) Tuner with insertable antenna coupler
JP3917848B2 (en) Resonant circuit shield structure
JPH08195618A (en) Antenna structure of portable electronic equipment
GB2146847A (en) Electrical inductance device
US5250753A (en) Wire assembly for electrically conductive circuits
JPS6210056B2 (en)
JPH0897036A (en) Electronic circuit board
JPS6057703A (en) Reception antenna of am receiver
JPH0132726Y2 (en)
JPS62206914A (en) Band pass filter
US3054082A (en) Impedance mounting device
KR960006849B1 (en) Print coil
JPS6033626Y2 (en) μ tuner terminal connection device

Legal Events

Date Code Title Description
AS Assignment

Owner name: MOTOROLA, INC., ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KING, JEFFREY S.;REEL/FRAME:005097/0662

Effective date: 19890623

FEPP Fee payment procedure

Free format text: PAT HLDR NO LONGER CLAIMS SMALL ENT STAT AS INDIV INVENTOR (ORIGINAL EVENT CODE: LSM1); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19990507

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362